| 年份 | 单位：% |
| 含“(E)”其对应值为系统预测，仅供参考。 | |
| 2026（E） | 购买后可见 » |
| 2025（E） | 购买后可见 » |
| 2024（E） | 购买后可见 » |
| 2023 | 购买后可见 » |
| 2022 | 购买后可见 » |
| 2021 | 购买后可见 » |
| 2020 | 购买后可见 » |
| 2019 | 购买后可见 » |
| 2018 | 购买后可见 » |
| 2017 | 购买后可见 » |
| 2016 | 购买后可见 » |
| 2015 | 购买后可见 » |
| 2013 | 购买后可见 » |
| 2012 | 39.30 |
| 2011 | 40.40 |
| 2010 | 41.10 |
| 2009 | 41.00 |
| 2008 | 43.70 |
| 2007 | 43.10 |
| 2006 | 43.00 |
| 2005 | 45.50 |
| 2004 | 47.20 |
| 2003 | 45.60 |
| 2002 | 46.20 |
| 2001 | 47.70 |
| 2000 | 49.10 |
| 1999 | 52.60 |
| 1998 | 53.40 |
| 1997 | 55.10 |
| 1996 | 56.30 |
| 1995 | 58.60 |
| 1994 | 58.90 |
| 1993 | 58.10 |
| 1992 | 57.60 |
| 1991 | 57.60 |
| 1990 | 58.80 |
| 1989 | 54.80 |
| 1988 | 54.00 |
| 1987 | 55.80 |
| 1986 | 56.40 |
| 1985 | 57.80 |
| 1984 | 59.20 |
| 1983 | 59.40 |
| 1982 | 60.70 |
| 1981 | 59.90 |
| 1980 | 61.80 |
| 1979 | 64.00 |
| 1978 | 67.70 |
| 1965 | 68.50 |
| 1964 | 67.10 |
| 1957 | 65.70 |
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